P6SMB68AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB68AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 58.1V reverse standoff with 92V maximum clamping voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The P6SMB68AT3G operates as a general-purpose TVS diode in surface mount SMB (DO-214AA) packaging, designed to protect circuits from transient voltage spikes. Its obsolete status requires engineers to identify active alternative components that maintain electrical and mechanical compatibility.

Substiute Parts

P6SMB68AT3G

Littelfuse Inc.In Stock: 237996P6SMB68AT3G Datasheet

Current PartRFQ

1KSMB68A

Taiwan Semiconductor CorporationIn Stock: 573381KSMB68A Datasheet

MFR RecommendedRFQ

P6SMB68A

Eaton - Electronics DivisionIn Stock: 32269P6SMB68A Datasheet

MFR RecommendedRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

MFR RecommendedRFQ

P6SMB68A

Eaton - Electronics DivisionIn Stock: 32269P6SMB68A Datasheet

MFR RecommendedRFQ

SM6T68A

STMicroelectronicsIn Stock: 125258SM6T68A Datasheet

MFR RecommendedRFQ

SM6T68AY

STMicroelectronicsIn Stock: 980SM6T68AY Datasheet

MFR RecommendedRFQ

SMBJP6KE68A-TP

Micro Commercial CoIn Stock: 5551SMBJP6KE68A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB68AT3G is determined by the following critical electrical parameters:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Clamping (Max) @ Ipp: 92V
• Package / Case: DO-214AA, SMB (surface mount)
• Unidirectional Channels: 1
• Type: Zener TVS diode

Substitute parts must maintain the same reverse standoff voltage (58.1V) and clamping voltage (92V) to ensure circuit protection performance. Peak pulse current and power ratings may vary within acceptable ranges for the application. All substitutes must use identical surface mount SMB packaging to ensure PCB compatibility without layout modifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Exact Voltage Match)

1KSMB68A, SM6T68A, SM6T68AY, and SMBJP6KE68A-TP maintain the exact 58.1V reverse standoff and 92V clamping voltage specifications of the P6SMB68AT3G. All are active products with current manufacturing status and full RoHS3 compliance. These parts are direct electrical equivalents suitable for one-to-one replacement.

1KSMB68A offers enhanced peak pulse current (10.9A) and power rating (1000W), providing additional margin for transient protection. SM6T68A and SM6T68AY provide higher peak pulse current (33A at 8/20µs pulse), enabling use in higher-energy transient environments while maintaining the same clamping voltage. SM6T68AY includes AEC-Q101 automotive qualification for applications requiring automotive-grade components.

SMBJP6KE68A-TP provides extended operating temperature range (-55 to 175°C) compared to the original part, beneficial for extreme temperature applications.

Secondary Substitute (Voltage Deviation)

SMBJ54A operates at 54V reverse standoff with 87.1V clamping voltage, representing a 4V reduction in both parameters. This part is suitable only for applications where the lower voltage threshold is acceptable and provides adequate protection margin for the specific circuit design.

All substitute parts maintain identical SMB surface mount packaging, eliminating PCB layout modifications. Selection should be based on application-specific transient energy levels, temperature requirements, and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ54A as a direct replacement for P6SMB68AT3G?

A: SMBJ54A operates at 54V reverse standoff versus 58.1V for the P6SMB68AT3G, and clamps at 87.1V versus 92V. This represents a 4V reduction in both parameters. Substitution is possible only if circuit analysis confirms adequate protection at the lower voltage threshold. For applications requiring exact voltage matching, use 1KSMB68A, SM6T68A, SM6T68AY, or SMBJP6KE68A-TP instead.

Q: What is the difference between SM6T68A and SM6T68AY?

A: Both parts share identical electrical specifications: 58.1V reverse standoff, 92V clamping voltage, and 33A peak pulse current. SM6T68AY includes AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging. SM6T68A is supplied in Cut Tape & Digi-Reel format. Selection depends on packaging requirements and whether automotive-grade qualification is necessary.

Q: Do all substitute parts use the same SMB package?

A: Yes. All substitute parts use DO-214AA (SMB) surface mount packaging, ensuring mechanical and PCB compatibility without layout modifications. Supplier device package designations may vary (SMB, DO-214AA, SMBJ), but all refer to the same physical form factor.

Q: Which substitute offers the highest peak pulse current?

A: SM6T68A and SM6T68AY both provide 33A peak pulse current at 8/20µs pulse width, compared to 6.5A for the original P6SMB68AT3G. These parts are suitable for applications requiring higher transient energy suppression while maintaining the same clamping voltage.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the environmental compliance of the original P6SMB68AT3G.

Q: What is the temperature range difference between substitutes?

A: The original P6SMB68AT3G operates from -65 to 150°C. 1KSMB68A and SMBJP6KE68A-TP extend the upper limit to 175°C. SM6T68A, SM6T68AY, and SMBJ54A operate from -55 to 150°C. Selection should match application temperature requirements.